Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea7b48afaa8891e…

MALICIOUS

PDF

84.1 KB Created: 2021-07-16 17:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4f6764910e5c4c227569d0793bba5cb SHA-1: fe253ef7da1d32908c7834094a190813b72e8f50 SHA-256: 1ea7b48afaa8891e2c94c1516496ae5ef68bdc1b34cff9319c58b45e972a75fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or lead to phishing pages. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/826e51c83b984f0180c5ac4f41c08ad5/disobenatezajawonokakisiv.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91bcbe34c4---nugenu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9901b262c.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/77df4416c84afe90bcfb6ad8286e8373/2553658876.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/dk2tp1m564lksse1f3fe57bjlo/19405797075.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/66h2fau12tt3ihjb94ibjglujj/xufuzujolufi.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/gerabejagasarifaxaf.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd3308f37---begikuxuwefawogejazad.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd35ec768d---ketabitogan.pdfIn PDF document text
    • https://defaico.com/d/files/3937557694.pdfIn PDF document text
    • http://omni-links.com/fudude.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/nbm9en8jfn5eqnq1j1t566c36d/tezakizenofile.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/12140845197.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/75699866540.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608248ecba2be---jiwawe.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/19826685736.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/sonenaresevefumemil.pdfIn PDF document text
    • http://cartopack.com/Images/file/depinelurotu.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/n8dmf7gl7lj1qn01mp7eo30uuk/rasodizobejivexes.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16e980cf99---5829464508.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/45448669853.pdfIn PDF document text
    • http://industra.sk/userfiles/file/93041478466.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105150835.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01877b4da---xajasajuxejadu.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/13448540667.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/83525944260.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083dabba82ca---35761925986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=create+a+word+search+worksheetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 17680 bytes
SHA-256: 6882b136b66f2506bf9a7baddee7bb551d2e85e53fcffa8749026b65518b2dcb
font_01_sfnt_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 10436 bytes
SHA-256: 2f84a054aca5f322dcbea377c3bb483b8ded923004da834db8e2c1a42b55fdb5